Bibliographies thématiques / Metal Nano-particles - Surface Plasmon Bands

Littérature scientifique sur le sujet « Metal Nano-particles - Surface Plasmon Bands »

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Publié le 7 septembre 2023

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Articles de revues sur le sujet "Metal Nano-particles - Surface Plasmon Bands"

Mädler, L., W. J. Stark et S. E. Pratsinis. « Simultaneous deposition of Au nanoparticles during flame synthesis of TiO2 and SiO2 ». Journal of Materials Research 18, n^o 1 (janvier 2003) : 115–20. http://dx.doi.org/10.1557/jmr.2003.0017.

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Nanostructured gold/titania and gold/silica particles with up to 4 wt% Au were made by a single-step process in a spray flame reactor. Gold(III)-chloride hydrate and titania- or silica-based metalorganic precursors were mixed in a liquid fuel solution, keeping concentrations in the flame and overall combustion enthalpy constant. The powders were characterized by x-ray diffraction, transmission electron microscopy, Brunauer–Emmett–Teller, and ultraviolet–visible analysis. The titania or silica specific surface area and the crystalline structure of titania were not affected by the presence of gold in the flame. Furthermore the size of the gold deposits was independent of the metal oxide support (TiO2 or SiO2) and its specific surface area (100 and 320 m2/g, respectively). The gold nanoparticles were nonagglomerated, spherical, mostly single crystalline, and well dispersed on the metal oxide support. Depending on the Au weight fraction (1, 2, and 4 wt%) the Au nanoparticles' mass mean diameter was 3, 7, and 15 nm, respectively, on both titania and silica. The particles showed surface plasmon absorption bands in the ultraviolet–visible region, which is typical for nano-sized gold. This absorption band was red shifted in the case of the titania support, while no shift occurred with the silica support.

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Jiang, Meixia, Qian Li, Xiaowei Cui, Fengjiao Long, Fenglian Ye, Lili Gu, Xianglan Li et Xiaohua Gong. « Bio-fabricated bioactive arisaema triphyllum aqueous extract-loaded nano-ZnO particles improve the nursing care of esophageal cancer ». Materials Express 10, n^o 10 (31 octobre 2020) : 1620–27. http://dx.doi.org/10.1166/mex.2020.1800.

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Metal nanoparticles, synthesized using phyto-constituents, are one of the most economical and environmentally friendly materials. Biogenic zinc oxide nanoparticles (ZnONPs) obtained from Arisaema triphyllum plant extract were synthesized and characterized using UV-visible spectroscopy, XRD, TEM, and EDX. The presence of various plant extracts and the zinc oxide capping of ZnONPs was confirmed using UV-visible spectroscopy, further confirming the existence of ZnO in the 400–430 nm region based on its specific surface plasmon resonance. XRD patterns showed ZnONP-centered cubic crystalline assembly, while electron microscopy showed that the formation of spherical ZnONPs varied from ∼10 nm to 15 nm in diameter. Strong ZnONPs bands were established, as verified by EDX. The anticancer properties of ZnONPs prepared with different extracts were evaluated using esophageal cancer cells. High levels of anticancer activity against the two esophageal cancer cell lines, EC109 and TE8, were observed. The morphological changes of the esophageal cancer cells were evaluated using AO-EB and nuclear staining biochemical methods. Hemolysis assays with human erythrocytes showed excellent bio-compatibility with ZnONPs. To the best of our knowledge, this is the first study to report the use of A. triphyllum-loaded biogenic ZnONPs against esophageal cancer cells.

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Kulriya, P. K., V. N. Singh, D. C. Agarwal, S. Ojha et D. K. Avasthi. « Localized Surface Plasmon Resonance Studies on Pd/C Nano-Composite System : Effect of Metal Concentration and Annealing Temperature ». Journal of Nanoscience and Nanotechnology 20, n^o 6 (1 juin 2020) : 3859–65. http://dx.doi.org/10.1166/jnn.2020.17508.

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The effects of metal concentration and annealing temperature on the localized surface plasmon resonance (LSPR) properties of the Pd nanoparticles (NP) dispersed in carbon were investigated. The Pd/C nano-composite thin films with 7 to 39 atomic % concentration of metal content were deposited using the atom beam co-sputtering techniques and subjected to annealing at temperature varying from 300 °C to 600 °C. The UV-vis spectroscopy studies on as-prepared films displayed a Mie scattering profile, but not well-defined LSPR bands were observed for all the values of Pd concentration. This is attributed to the smaller size (3–4 nm) of Pd NPs and rough Pd/C interface, as confirmed from TEM studies. When samples were annealed at a temperature of 300 °C, three broad LSPR absorption bands in the visible region, along with a sharp peak at 210 nm, were observed and the effect of Pd concentration variation was insignificant on their position. The multiple LSPR bands were observed due to agglomeration NPs, which is consistent with earlier reports and is also observed in the TEM images. When annealing temperature was subsequently increased to 500 °C, a blue shift in the LSPR peak position with an increase in the Pd concentration was observed, which phenomena is attributed to the formation of bigger NPs with the formation of sharp NPs-interface at high temperature upon annealing. A monotonic increase in the magnitude and decrease in the FWHM with an increase in concentration suggested change in the dielectric function of sample due to the growth of NPs. This is further confirmed from XRD studies, where strain relaxation and grain growth were observed. The intensity of the SPR peak decreased with an increase in the annealing temperature. The LSPR peak disappeared on annealing at a temperature of 600 °C, suggesting the formation of continuous polycrystalline thin films of Pd. In summary, NPs size, metalmatrix interface, and concentration of metal play key roles in the tailoring the LSPR properties of the Pd.

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Proença, Manuela, Marco S. Rodrigues, Joel Borges et Filipe Vaz. « Gas Sensing with Nanoplasmonic Thin Films Composed of Nanoparticles (Au, Ag) Dispersed in a CuO Matrix ». Coatings 9, n^o 5 (25 mai 2019) : 337. http://dx.doi.org/10.3390/coatings9050337.

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Magnetron sputtered nanocomposite thin films composed of monometallic Au and Ag, and bimetallic Au-Ag nanoparticles, dispersed in a CuO matrix, were prepared, characterized, and tested, which aimed to find suitable nano-plasmonic platforms capable of detecting the presence of gas molecules. The Localized Surface Plasmon Resonance phenomenon, LSPR, induced by the morphological changes of the nanoparticles (size, shape, and distribution), and promoted by the thermal annealing of the films, was used to tailor the sensitivity to the gas molecules. Results showed that the monometallic films, Au:CuO and Ag:CuO, present LSPR bands at ~719 and ~393 nm, respectively, while the bimetallic Au-Ag:CuO film has two LSPR bands, which suggests the presence of two noble metal phases. Through transmittance-LSPR measurements, the bimetallic films revealed to have the highest sensitivity to the refractive index changes, as well as high signal-to-noise ratios, respond consistently to the presence of a test gas.

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Vasiljevic, Natasa, Vinicius Cruz San Martin et Andrei Sarua. « Electrodeposition of Plasmonic Nanostructures ». ECS Meeting Abstracts MA2022-02, n^o 23 (9 octobre 2022) : 985. http://dx.doi.org/10.1149/ma2022-0223985mtgabs.

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Electrochemical control and the use of electrodeposition in the design of dynamic plasmonics have attracted much attention in recent years.1 Development of dynamic plasmonic metamaterials is attractive for many applications such as molecular sensing and analysis, environmental monitoring, photo-catalysis, colour changing displays and electrochromic devices such as 'smart' windows. Electrodeposition is one of the most attractive ways to create and reversibly transform nanostructures' shape, size and chemical composition.2,3 Plasmonics is related to the localised surface excitations of electrons in metal nanostructures due to strong interactions with light. The resulted electric field enhancement due to the surface plasmons can be used to manipulate light–matter. Nanostructured Ag and Au are classic plasmonic materials. While silver is a metal that exhibits many advantages over gold, such as higher extinction coefficients in the blue and UV region of the EM spectrum, sharper extinction bands and extremely high field enhancements, its employment is hindered by low chemical stability. The most recent theoretical analysis suggests that Au-Ag derived nanostructures with controlled geometry, composition, and distribution can create new interesting optical phenomena.4 By developing Au-Ag based nanostructures, we can then benefit from combining optical properties of Au and Ag and, at the same time, improve the chemical stability of silver. We investigated the electrodeposition of Au and Ag-based arrays of ordered and random nano-particles on indium tin oxide substrates from different solutions and studied their optical properties. We demonstrated that varying the electrodeposition parameters led to changes in both the resonance wavelength and the strength of resonance linked to the structural characteristics (size and shape) and the chemical composition of the deposited particles. Exploration of the dynamic reversible changes via electrodeposition will be presented. References: Y. Jin, L. Zhou, J. Liang, and J. Zhu, Adv. Photon., 3(4), 044002 (2021). G. Wang, X. Chen, S. Liu, C. Wong, S. Chu, ACS Nano, 10 (2), 1788–1794, (2016) C. J. Barile, D. J. Slotcavage, J. Hou, M. T. Strand, T. S. Hernandez, M. D. McGehee, Joule 1 (1), 133-145 (2017) G. Guisbiers, R. Mendoza-Cruz, L. Bazan-Diaz, J. J. Velazquez-Salazar, R. Mendoza-Perez, J. A. Robledo-Torres, J. L. Rodriguez-Lopez, J. M. Montejano-Carrizales, R. L. Whetten, Jose-Yacaman, M. ACS Nano, 10(1), 188-198, (2016)

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Ismail, Eman, Aliyah Saqer, Eman Assirey, Arshi Naqvi et Rawda Okasha. « Successful Green Synthesis of Gold Nanoparticles using a Corchorus olitorius Extract and Their Antiproliferative Effect in Cancer Cells ». International Journal of Molecular Sciences 19, n^o 9 (3 septembre 2018) : 2612. http://dx.doi.org/10.3390/ijms19092612.

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A facile bottom-up “green” synthetic route of gold nanoparticles (Au NPs) is described, using a leaf extract of the Malvaceae plant Corchorus olitorius as a reducing and stabilizing agent. The size and shape of the obtained nanoparticles were modulated by varying the amounts of the metal salt and the broth extract in the reaction medium. Only one hour was required for the complete conversion to Au NPs, suggesting that the reaction rate was higher or comparable to those of nanoparticles synthesized by chemical methods. The obtained nanoparticles were characterized by UV–visible spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, and thermal gravimetric analysis (TGA). While infrared spectroscopy was employed to characterize the various functional groups in the organic layer that stabilized the particles, TEM images were used to optimize the conditions for NPs growth. A low concentration of the C. olitorius extract yielded mixed triangular and hexagonal shapes; in contrast, quasi-spherical shapes of Au NPs with an average size of 37–50 nm were obtained at a higher extract broth concentration. The Au NPs displayed Surface Plasmon Resonance (SPR) bands at 535 nm. An in vitro cytotoxic assay of the biocompatible Au NPs revealed a strong cytotoxic activity in three human cancer cell lines, namely, colon carcinoma HCT-116, hepatocellular carcinoma HepG-2, and breast adenocarcinoma MCF-7. In-silico bioactivity, drug-likeness, and ADMET (Absorption, Distribution, Metabolism, Excretion, and Toxicity) predictions were conducted in order to examine the pharmacokinetic behavior of the compounds present in the C. olitorius extract.

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Shubina, T. V., D. S. Plotnikov, A. Vasson, J. Leymarie, M. Larsson, P. O. Holtz, B. Monemar, Hai Lu, W. J. Schaff et P. S. Kop’ev. « Surface-plasmon resonances in indium nitride with metal-enriched nano-particles ». Journal of Crystal Growth 288, n^o 2 (mars 2006) : 230–35. http://dx.doi.org/10.1016/j.jcrysgro.2005.12.003.

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Fedorenko, L. « Self-Organization Processes of Nanostructure Formation by Laser Radiation in Metal ». Advanced Materials Research 222 (avril 2011) : 18–23. http://dx.doi.org/10.4028/www.scientific.net/amr.222.18.

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The current state of knowledge about mechanisms of metal nano-particles (NP) formation processes induced by the interaction of high-energy laser beam with surface of the metallic lattices (Au, Ag, Cu) is presented. The review includes an evaluation of the contribution of self-organized effects into the processes of the metal nano-structurization depending on the laser mode, external factors and internal parameters of an active zone. It was noticed that intensive pulsed laser illumination enabled to stimulate nano-fragmentation at the fluencies near and above the melting threshold of the metal in different mediums The laser induced processes of metallic particles formation by ablation of the metal target with consequent NP sizes stabilization by precise temperature tuning in the active zone, local plasmon resonance in liquids, and microablation mechanism in metal films in the conditions of surface plasmon resonance (SPR) due to self-organization effects are considered. Comparative analysis of the laser nano-technologies in air, vacuum, rarefied gas and liquid environments showed the advantages of self-organization in NP generation processes based on the SPR effects and their perspectives.

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Nonaka, Shigehiko, Koichi Kawajiri, Hirokazu Yasuba, Takuya Sugiyama et Stefan T. Ivanov. « Novel Optical Surface Plasmon Propagating along a Planar Metal with Nano-Dielectric Particles ». Japanese Journal of Applied Physics 41, Part 1, No. 7B (30 juillet 2002) : 4798–801. http://dx.doi.org/10.1143/jjap.41.4798.

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Li, Jin, Haoru Wang, Zhi Li, Zhengcheng Su et Yue Zhu. « Preparation and Application of Metal Nanoparticals Elaborated Fiber Sensors ». Sensors 20, n^o 18 (10 septembre 2020) : 5155. http://dx.doi.org/10.3390/s20185155.

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In recent years, surface plasmon resonance devices (SPR, or named plamonics) have attracted much more attention because of their great prospects in breaking through the optical diffraction limit and developing new photons and sensing devices. At the same time, the combination of SPR and optical fiber promotes the development of the compact micro-probes with high-performance and the integration of fiber and planar waveguide. Different from the long-range SPR of planar metal nano-films, the local-SPR (LSPR) effect can be excited by incident light on the surface of nano-scaled metal particles, resulting in local enhanced light field, i.e., optical hot spot. Metal nano-particles-modified optical fiber LSPR sensor has high sensitivity and compact structure, which can realize the real-time monitoring of physical parameters, environmental parameters (temperature, humidity), and biochemical molecules (pH value, gas-liquid concentration, protein molecules, viruses). In this paper, both fabrication and application of the metal nano-particles modified optical fiber LSPR sensor probe are reviewed, and its future development is predicted.

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Thèses sur le sujet "Metal Nano-particles - Surface Plasmon Bands"

Hao-YuanChung et 鍾浩元. « Arrayed Metallic Micro/Nano Particles for Localized Surface Plasmon Resonance Based on Metal Contact Transfer Lithography ». Thesis, 2011. http://ndltd.ncl.edu.tw/handle/50523287853162068846.

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Li, Li-Guo, et 李立國. « Strain Release of InGaN/GaN Quantum Wells through Nano-hole Fabrication and Formation of Metal Particles for Surface Plasmon Study with the Anodic Aluminum Oxide Technique ». Thesis, 2008. http://ndltd.ncl.edu.tw/handle/64807688490105296426.

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碩士
國立臺灣大學
光電工程學研究所
96
In this research, we fabricate anodic alumina oxide (AAO) on GaN and InGaN/GaN quantum well (QW) structure. With the AAO technique, we can fabricate a thin aluminum oxide film with nano-pore array on the nitride structure, which is used as a mask to deposit metal nano-particle arrays on to study the surface plasmon (SP) characteristics, or to release the strain in the QW. Our first study is about the SP characteristics of a silver or gold nano-particle array on GaN template. We change the AAO process condition to control the hole diameter and interpore distance such that we can vary the particle size and density of the metal nano-particle array. We observe the SP absorption spectra and its resonance frequencies of different particle sizes and densities. The second study is about the strain relaxation phenomenon by fabricating nano-hole array patterns with the AAO technique on an InGaN/GaN QW structure. The effective strain relaxation, leading to the significant enhancement of emission efficiency and reduction of quantum-confined Stark effect (QCSE), in a high-indium InGaN/GaN QW structure via nano-pore fabrication on the sample surface with the anodic aluminum oxide technique is demonstrated. By generating nano-pores of 60 nm in size, 4.71 x 109 cm-2 in pore density, and a depth several nm above the QW, the internal quantum efficiency (IQE) can be increased by about three times and the QCSE is reduced by 2.5 times while the emission spectrum is blue-shifted by 14 nm in the green range. With this approach, it is possible to achieve a higher IQE and a smaller QCSE by relaxing the built-in strain of a higher-indium QW structure and blue-shifting its emission, when compared with a lower-indium sample of the same emission spectrum as the blue-shifted one.

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Li, Li-Guo. « Strain Release of InGaN/GaN Quantum Wells through Nano-hole Fabrication and Formation of Metal Particles for Surface Plasmon Study with the Anodic Aluminum Oxide Technique ». 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2607200817144200.

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Chapitres de livres sur le sujet "Metal Nano-particles - Surface Plasmon Bands"

Charlé, K. P., W. Schulze et B. Winter. « The size dependent shift of the surface plasmon absorption band of small spherical metal particles ». Dans Small Particles and Inorganic Clusters, 471–75. Berlin, Heidelberg : Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74913-1_108.

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Kenyon, Ian R. « Electrons in solids ». Dans Quantum 20/20, 75–94. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198808350.003.0005.

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Electron energy bands in solids are introduced. Free electron theory for metals is presented: the Fermi gas, Fermi energy and temperature. Electrical and thermal conductivity are interpreted, including the Wiedermann–Franz law. The Hall effect and information it brings about charge carriers is discussed. Plasma oscillations of conduction electrons and the optical properties of metals are examined. Formation of quasi-particles of an electron and its screening cloud are discussed. Electron-electron and electron-phonon scattering and how they affect the mean free path are treated. Then the analysis of crystalline materials using electron Bloch waves is presented. Tight and weak binding cases are examined. Electron band structure is explained including Brillouin zones, electron kinematics and effective mass. Fermi surfaces in crystals are treated. The ARPES technique for exploring dispersion relations is explained.

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Gavilán, H. « Nanomaterials and their Synthesis for a Sustainable Future ». Dans Materials Research Foundations, 233–310. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902639-8.

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Nanomaterials are structured materials whose dimensions lie in the nanoscale, at least in one dimension. Their small size and high surface area lead to properties not observed in their bulky state, some of which have revolutionized different fields in the last decades. While it is acknowledged that nanomaterials have been obtained or created since ancient times, with little or no knowledge about nanotechnology itself, it was not until this century that the development of nanomaterials was done on purpose, achieving a high level of sophistication in terms of fine-tuning the nanomaterial’s properties, including size, shape, chemical composition, and structure. As such, nanomaterials are used in many industries as advanced materials with high strength while being light, superhydrophobicity, and antimicrobial properties, to name a few. Some of the nanomaterials with high value, given their outstanding properties, are quantum dots (superior luminescence properties), gold nanoparticles (localized surface plasmons), layered perovskites (optimal band gaps for materials like solar cells), and carbon nanotubes (very high tensile strength, electrical conductivity). Consequently, there has been a tremendous boom of nanomaterials in the industry, so they have been introduced into our daily lives. Despite the little knowledge available about their impact on the environment and our health, such intensified use has raised some concerns about the safe use of nanomaterials. Furthermore, due to the extended use of resources and current pollution levels, given that access to energy, food, clean water, and health is not guaranteed to future generations, the concept of “sustainability” and the transition from a linear to a circular economy is becoming more important in the manufacturing of products. As a result, society is making efforts to implement the 3Rs ‘reduce’, ‘reduce’, and ‘recycle’ in our community. In addition, other Rs are of utmost importance: ‘Recover’, ‘Redesign’, ‘Remanufacture’, etc., so that products, materials, and resources are maintained in the economy for as long as possible, and the generation of waste is minimized. This book chapter tackles all these aspects for nanomaterials and “nano-products” (nanomaterials already introduced in specific markets or industries). In particular, it analyzes and collects data available in the literature, where it was possible to implement the sustainability concept in different steps of the life-cycle of nanomaterials: from their synthesis to subsequent remanufacturing processes. In this line, this chapter discusses the ‘green’ synthesis of nanomaterials, which are environmentally friendly processes that take place in natural environments (i.e., processes where nanoparticles are produced by microorganisms), or techniques that eliminate toxic reagents, minimize waste, reduce energy consumption and use ecological solvents. In addition, a section of the chapter covers reported strategies where the recovery, reuse, and recycling of nanomaterials were successful. The chapter has been structured into five parts. First, a general introduction to nanomaterials is provided. Then, different green synthesis methods are described, focusing on the biosynthesis of metal/metal-based oxide nanoparticles. After, the definition and classification of nanowastes are given, as well as a general overview of nano-toxicity and the different management procedures applied to nanomaterials after their end-of-life. Then, the book chapter covers the reuse and recycling of nanomaterials. In the fourth section of the book chapter, we provide data on ‘safe- and sustainable-by-design’ (SSbD) synthesis methods of nanomaterials. SSbD is a key concept for implementing a circular economy on nanomaterials. Finally, we provide some conclusions and final remarks about nanomaterials and their synthesis for a sustainable future.

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Actes de conférences sur le sujet "Metal Nano-particles - Surface Plasmon Bands"

Chung, H. Y., C. Y. Wu, C. H. Chen et Y. C. Lee. « Arrayed metallic micro/nano particles for localized surface plasmon resonance based on metal contact transfer lithography ». Dans 2012 7th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2012. http://dx.doi.org/10.1109/nems.2012.6196788.

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Menegotto, Thiago, et Flavio Horowitz. « Surface plasmon resonances of interacting metal nano-particles in thin films : extension of Maxwell Garnett theory ». Dans Optical Interference Coatings. Washington, D.C. : OSA, 2013. http://dx.doi.org/10.1364/oic.2013.tc.4.

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Ju, Seongmin, Pramod R. Watekar, Seongmook Jeong, Youngwoong Kim, Hyong Sun Kim, Poram Jeon, Cheol Jin Kim et Won-Taek Han. « Development of a Novel Cladding-doped Optical Fiber with Au Metal Nano-particles for Surface Plasmon Resonance Sensor Applications ». Dans Specialty Optical Fibers. Washington, D.C. : OSA, 2011. http://dx.doi.org/10.1364/sof.2011.sotuc3.

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Hong, Lei, Hao Wang, Junshuai Li, Rusli et HongYu Yu. « Surface plasmon enhanced light absorption for thin film poly-silicon solar cell with hybrid structure and metal alloy nano-particles ». Dans 2011 37th IEEE Photovoltaic Specialists Conference (PVSC 2011). IEEE, 2011. http://dx.doi.org/10.1109/pvsc.2011.6186090.

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Lee, Minyung. « Nonlinear Optical Properties of Au Nanocrystals Embedded in Silicate Thin Films ». Dans Nonlinear Optics : Materials, Fundamentals and Applications. Washington, D.C. : Optica Publishing Group, 1996. http://dx.doi.org/10.1364/nlo.1996.nthe.3.

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A lot of nanometer-sized metal particles exhibit high optical nonlinearity and fast time response in the surface plasmon absorption region,1 so they have potential application in nonlinear optical devices in the future. Especially, gold nano crystals were most intensively studied and their linear and nonlinear optical properties are relatively well known.2 However, preparation techniques for gold nano particles in inorganic oxide glass are not well established yet and controlling the nanocrystal size has to be elaborated for the systematic study on the nonlinear optical properties of metal nanocrystals.

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